Triple Trouble
The Duk of death
- Joined
- Sep 12, 2005
- Messages
- 2,465
- Ride
- '05 Rocket III '73 Norton Commando 65 Norton Atlas
I've finally got the details ironed out for a fork upgrade. This info is courtesy of Wayne Tripp and I'm just passing along the information. The first is a very simple spacer which is placed under the spring and helps control the damping. You need to cut the top pre-load tube by the same amount as the spacer length. The second variation should be self explanatory. Following is from Wayne:
"We have since machined a few "spacers" that tighten up the clearances on the bottoming cone piston a bit more than just using thick walled tubing. This improves the dampening even more. NO, I do not want to make more, but the details are below.
1.) Easy and cheap - 1.5 in. OD tubing, .200 wall thickness, 1.575 in long.
OR,
2.) Machined for closer clearances - 1.522 OD, .955 ID, 1.575 long. - add .125 in wide by .050 deep slot along outside.
Place on top of bottoming cone (underneath spring), and cut 1.575 inches from pre-load tube above spring. Cut less if more pre-load is desired. If using Progressive springs, you will need to cut for the pre-load in addition to what Progressive recommends for the spring used.
-Wayne"
"We have since machined a few "spacers" that tighten up the clearances on the bottoming cone piston a bit more than just using thick walled tubing. This improves the dampening even more. NO, I do not want to make more, but the details are below.
1.) Easy and cheap - 1.5 in. OD tubing, .200 wall thickness, 1.575 in long.
OR,
2.) Machined for closer clearances - 1.522 OD, .955 ID, 1.575 long. - add .125 in wide by .050 deep slot along outside.
Place on top of bottoming cone (underneath spring), and cut 1.575 inches from pre-load tube above spring. Cut less if more pre-load is desired. If using Progressive springs, you will need to cut for the pre-load in addition to what Progressive recommends for the spring used.
-Wayne"